This document is a CAT 3406E flash code 55 troubleshooting reference explaining the “No Diagnostic Code Detected” status for Caterpillar on-highway truck engines. It confirms that flash code 55 indicates no system faults have been detected since the last powerup and that no corrective action is required.
Official CAT 3406E flash code 55 document details
| Brand | Caterpillar (CAT) |
| Model coverage | 3406E, C-10, C-12 Truck Engines (configurations 8YS, 9NS, 5DS, 1LW) |
| System / Group | Diagnostic Trouble Codes — SMCS 1900, PID 0000 FMI 00 |
| Publication no. | RENR1328-08 |
| Year / Revision | Published 01/10/2008, updated 16/10/2008 |
| Pages | 1 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- No Diagnostic Code Detected (55) — Overview
- Conditions Which Generate This Code
- System Response
- Possible Performance Effect
- Troubleshooting — Test Step 1
Applicable truck models
This troubleshooting page applies to Caterpillar 3406E, C-10, and C-12 on-highway truck engines, specifically configurations 8YS, 9NS, 5DS, and 1LW. The C-12 Truck Engine 9NS00001-UP is explicitly listed. Flash code 55 is a status code rather than a fault: it confirms no diagnostic trouble codes are active. The document references the Check Engine Lamp Circuit Test procedure for additional information on how flash codes are displayed via the check engine lamp. This code does not appear in Caterpillar Electronic Technician (ET) software. For official Caterpillar product support and additional engine documentation, visit Caterpillar Support.
Who needs this 3406E flash code 55 manual
Diesel mechanics and workshop owners working on CAT 3406E, C-10, or C-12 powered trucks will find this reference useful when a flash code 55 appears during diagnostics. It quickly confirms that the engine control module has detected no faults, saving troubleshooting time and preventing unnecessary part replacements.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download.
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